Comment by bluewyvern

Getting the permafrost signet isn't that RNG considering there are only three potential tanking enchants and two of them have mastery + avoidance (one dodge, the other parry) - I'd say you have maybe a 10% chance of getting either of them. Getting dodge is preferable, but the margin between the two is probably small. Also if you can get this, you're probably not far off doing heroic conclave for the heroic permafrost ring also.